71、My brother always a with me．We can't get on well．
When you laugh，you'll open your mouth and show your teeth．The 41 your teeth are, the happier you look 42 is that?
It's because your teeth are import 43 many ways．If you take care of them, they can also help to 44 you．Strong, healthy teeth help you eat the right food and help you grow __45 ．They also help you speak clearly．
You can take care of your teeth by doing like these：
● Brush your teeth 46 a day-after breakfast and before bedtime．
● Brush all of your teeth，not just the front ones． 47 some time on the teeth along the sides and in the back．
● Take your time while brushing．Spend 48 3 minutes each time．
● Be sure your toothbrush is soft (软的)．Ask your parents 49 a new toothbrush every three months for you．
● Care about what you eat and drink．Eat more fruits and vegetables and less junk food．Drink more 50 and less drinks．
41．A．healthy B．healthier C．healthiest D．unhealthy
42．A．What B．Where C．Why D．When
43．A．on B．for C．with D．in
44．A．look after B．look for C．look up D．look at
45．A．early B．easily C．happily D．quickly
46．A．two B．twice C．one D．once
47．A．Spend B．Take C．Cost D．Pay
45．A．1ess than B．more than C．less D．more
49．A．buy B．buying C．to buy D．bought
50．A．tea B．apple juice C．coffee D．water
40．The two girls were at the news．
A．amazing；amazing B．amazed；amazed
C．amazing；amazed D．amazed；amazing
39． 100 years will the world be like?
A．After, What B．Before，how C．In，What D．On，how
38．On weekend, you'll yourselves move casually．
A．be able to dress B．can wear C．be able to wear D．can dress
37．--I'm sorry I my homework at home．
--But don't forget it here tomorrow．
A．forgot, to bring B．left, to bring C．forgot，bringing D．left, bringing